File complexfieldget.h

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#ifndef COSMOINTERFACE_COMPLEXFIELDALGEBRA_HELPERS_COMPLEXFIELDGET_H
#define COSMOINTERFACE_COMPLEXFIELDALGEBRA_HELPERS_COMPLEXFIELDGET_H

/* This file is part of TempLat, available at https://cosmolattice.github.io/templat .
   Copyright 2021-2026 The TempLat authors, see AUTHORS.md.
   Released under the MIT license, see LICENSE.md. */

// File info: Main contributor(s): Adrien Florio, Year: 2019

#include "TempLat/util/rangeiteration/tag.h"
#include "TempLat/lattice/algebra/complexalgebra/helpers/hascomplexfieldget.h"
#include "TempLat/lattice/algebra/helpers/iscomplextype.h"

namespace TempLat
{
  class ComplexFieldGetter
  {
  public:
    template <typename R>
      requires IsComplexType<R>
    static auto get(R &&r, Tag<0> t)
    {
      // Inlined from Real(r) to avoid a real.h -> ascomplexfield.h -> complexfieldget.h include cycle;
      // for a complex value the HasComplexFieldGet Real overload never applies, so this is Real's only body.
      return r.real();
    }

    template <typename R>
      requires IsComplexType<R>
    static auto get(R &&r, Tag<1> t)
    {
      // Inlined from Imag(r); see the note on the Tag<0> overload above.
      return r.imag();
    }

    template <typename R, int N>
      requires(!IsComplexType<R> && HasComplexFieldGet<R>)
    static auto get(R &&r, Tag<N> t)
    {
      return r.ComplexFieldGet(t);
    }
  };
} // namespace TempLat

#endif